Rolled iron core traction transformer

Abstract

A rolled iron core traction transformer, comprising an iron core ( 1 ); the iron core ( 1 ) is formed by splicing two symmetrical annealed iron-core closed single frames ( 1 - 1 ); each iron-core closed single frame ( 1 - 1 ) is formed by sequentially coiling continuous silicon steel sheets; the iron-core closed single frame ( 1 - 1 ) has two iron core column single bodies ( 1 - 1 - 1 ) having approximately semicircular cross sections; the iron core ( 1 ) has two iron core columns ( 1 - 2 ) thereon spliced by the iron core column single bodies ( 1 - 1 - 1 ) and having approximately circular cross sections; each iron core column ( 1 - 2 ) is sequentially provided with a low-voltage T winding ( 6 ), a low-voltage F winding ( 5 ) and a high-voltage winding ( 4 ) thereon from inside to outside; two sides of each high-voltage winding ( 4 ) are respectively provided with a first tapping area and a second tapping area; the first tapping area is provided with low-voltage side high-voltage tapping outgoing lines ( 16 ); the second lapping area is provided with high-voltage side high-voltage tapping outgoing lines ( 18 ); two low-voltage side high-voltage tapping outgoing lines ( 16 ) are connected together via a no-load voltage regulation switch ( 9 ); and two high-voltage side high-voltage tapping outgoing lines ( 18 ) are connected together via another no-load voltage regulation switch ( 9 ). The transformer reduces no-load loss, has a small no-load current, low noise and strong anti-short circuit capability, reduces the electrodynamic force generated by a sudden short circuit, and improves the short circuit tolerance capability of the transformer.

The invention claimed is: 
     
       1. A rolled iron core traction transformer, comprising an iron core comprising two annealed iron-core closed single frames symmetrically spliced together, each iron-core closed single frame being formed of sequentially coiled continuous silicon steel sheets and having two iron-core column single bodies, the iron-core column single bodies having approximately semicircular sections, two iron-core columns which have approximately circular sections and having spliced thereon two iron-core column single bodies, each iron-core column being sequentially provided with a low voltage T winding, a low voltage F winding and a high voltage winding thereon from inside to outside; two sides of each high voltage winding are respectively provided with a first tapping area and a second tapping area, the first tapping area is provided with low voltage side high voltage tapping outgoing lines, the second tapping area is provided with high voltage side high voltage tapping outgoing lines, two low voltage side high voltage tapping outgoing lines are connected together with a no-load voltage regulation switch, and two high voltage side high voltage tapping outgoing lines are connected together with another no-load voltage regulation switch, the side of the high voltage winding is provided with high voltage winding outgoing lines, low voltage T winding outgoing lines of the low voltage T winding is provided on one side of the opposite direction of the high voltage winding outgoing lines on the low voltage T winding, low voltage F winding outgoing lines of the low voltage F winding is provided on one side of the opposite direction of the high voltage winding outgoing lines on the low voltage F winding. 
     
     
       2. The rolled iron core traction transformer according to  claim 1 , wherein a separation trough for cooling is provided between two iron-core closed single frames. 
     
     
       3. The rolled iron core traction transformer according to  claim 1 , wherein two no-load voltage regulation switches are connected with a switch linkage for synchronous voltage regulation. 
     
     
       4. The rolled iron core traction transformer according to  claim 1 , wherein electrostatic plates are provided on the both ends of the low voltage F winding and the high voltage winding. 
     
     
       5. The rolled iron core traction transformer according to  claim 4 , wherein the electrostatic plate is formed by winding two semi-circular brass rings together. 
     
     
       6. The rolled iron core traction transformer according to  claim 1 , wherein a T winding skeleton is provided on the inside of the low voltage T winding, stays with caging device are provided between the T winding skeleton and the iron-core column, F winding skeleton is provided on the inside of the low voltage F winding, also the stay with caging device is provided between the F winding skeleton and the low voltage T winding, high voltage winding skeletons are provided on the inside of the high voltage winding, also the stay with caging device is provided between the high voltage winding skeletons and the low voltage F windings. 
     
     
       7. The rolled iron core traction transformer according to  claim 6 , wherein at least one of the T winding skeleton, the F winding skeleton and the high voltage winding skeleton is made of hard paper tube. 
     
     
       8. The rolled iron core traction transformer according to  claim 6 , wherein the T winding skeleton is provided with a drive slot, which can be driven by a winder. 
     
     
       9. The rolled iron core traction transformer according to  claim 7 , wherein the T winding skeleton is provided with a drive slot, which can be driven by a winder.